Development of new efficient premixed blended metakaolin-cementitious fireproofing compounds

作者：Shebl S S^*

来源：Cement, Wapno, Beton, 2010, 15(5): 279-+.

This study evaluates the effect of fireproofing of steel structures as one of the available options to control structure collapse. Attempting to develop fireproofing cementitious compounds with longest fire resistance rating at sufficient mechanical properties is also aimed. Different lightweight aggregates were used to adding to cement paste producing a new efficient premixed fireproofing cementitious materials. Perlite as beads form, Vermiculite as powder form, and Rockwool as fibers form had been used with different loading ratios. A replacement of ordinary Portland cement (OPC) by thermally activated metakaolin (MK) by a ratio of 10% was made to increases its mechanical strength and durability. Famous common commercial product called Fendolit MII was used for comparison purposes. It is a spray applied, single package factory controlled premix, based on vermiculite and Portland cement. An improvement of the compressive strength of about 168% of blended MK-cement compound with Vermiculite lightweight aggregate as powder form based on unit compressive strength of the Fendolit MII was observed. ASTM E119-07 is used to measure and describe the response and resistance of fireproofing cementitious compounds to fire under controlled conditions. Performance is defined as the period of resistance to standard exposure elapsing before the first critical point in behavior id observed. An improvement in the fire resistances of the blended MK-cement compound with different loadings of lightweight aggregates was achieved. It reaches to about 50%, 58%, and 26% based on unit fire resistance result of the Fendolit MII respectively, with loading of Vermiculite, Rockwool, and Perlit lightweight aggregate respectively. Also, the optimum loading of lightweight aggregate of blended MK-cement compound is 1.25-1.5.

• 出版日期2010-10